Pump device

Abstract

A pump head, which has a different mounting pitch of mounting screws, and a bracket are enabled to be easily attached and detached to and from a pump body without disassembling a whole pump. A pump device includes: a drive source; a pump body that has a first wall and a housing space on one side of the first wall, the housing space housing the drive source inside; a pump head that has a pump chamber, a suction port, and a discharge port, and is attached to another side of the first wall, the suction port and the discharge port being for transfer fluid and communicating with the pump chamber; a bracket that is arranged between the pump head and the first wall; a drive member that is driven in the pump chamber by the drive source; and a nut plate that has an annular shape and is arranged adjacent to the first wall in the housing space of the pump body.

1 . A pump device comprising:
 a drive source;   a pump body that has a first wall and a housing space housing the drive source inside on one side of the first wall;   a pump head that has a pump chamber, and a suction port and a discharge port for transfer fluid communicating with the pump chamber, and the pump head being attached to another side of the first wall;   a bracket that is arranged between the pump head and the first wall;   a drive member that is driven in the pump chamber by the drive source; and   a nut plate that has an annular shape and is arranged adjacent to the first wall in the housing space of the pump body, wherein   the nut plate has a plurality of sets of nut holes at different distances from a center and is arranged to be rotatable along the first wall around an axis which passes through the center and intersects with the first wall,   the first wall has a plurality of hole sections which are arranged at positions corresponding to the plurality of sets of nut holes, part of the plurality of hole sections are elongated hole sections which extend in a circumferential direction of the nut plate, and   the pump head and the bracket have a plurality of through holes that are arranged at a pitch which conforms to any one set of the plurality of sets of nut holes of the nut plate, and the pump head and the bracket are fixed to the first wall of the pump body by fastening bolts, via the hole sections of the first wall, to the one set of the nut holes of the nut plate conforming to the pitch of the plurality of through holes.   
     
     
         2 . The pump device according to  claim 1 , further comprising
 a waterproof plate that is arranged between the nut plate and the drive source in the housing space and liquid-tightly isolates the drive source from an outside of the pump body.   
     
     
         3 . The pump device according to  claim 2 , further comprising
 a fixing plate that fixes the drive source from an opposite side to the first wall of the pump body and is attached to the pump body to block the housing space.   
     
     
         4 . The pump device according to  claim 2 , wherein
 the drive source has a drive shaft to a tip of which a drive member is attached, and   in the nut plate, at least one set of the nut holes of the plurality of sets of nut holes is arranged in different positions in a circumferential direction of the nut plate with respect to other sets of the nut holes.   
     
     
         5 . The pump device according to  claim 4 , wherein
 the first wall has   a central opening through which the drive shaft of the drive source is inserted,   a plurality of first elongated hole sections which are formed around the central opening to radially open and in which part of the nut holes of the plurality of sets of nut holes appear at a position of the nut plate in a rotation direction,   a plurality of second elongated hole sections which are formed around the central opening to open along a circumferential direction of the central opening while being spaced apart from the plurality of first elongated hole sections and in which other part of the nut holes of the plurality of sets of nut holes appear at a position of the nut plate in the rotation direction, and   a plurality of round hole sections which are arranged around the central opening to be spaced apart from the plurality of first elongated hole sections and the plurality of second elongated hole sections, and in which other remaining nut holes of the plurality of sets of nut holes appear at a position of the nut plate in the rotation direction.   
     
     
         6 . The pump device according to  claim 5 , wherein
 the first wall further has a third elongated hole section which is formed around the central opening to radially open while being spaced apart from the plurality of first elongated hole sections, the plurality of second elongated hole sections and the plurality of round hole sections, and in which one nut hole of a set of the plurality of sets of nut holes appears at a position of the nut plate in the rotation direction.   
     
     
         7 . The pump device according to  claim 4 , wherein
 the plurality of sets of nut holes, which are provided in the nut plate, have first nut holes, second nut holes each of which is provided at a position at a longer distance from the center than the first nut holes, and third nut holes each of which is provided at a position at a longer distance from the center than the second nut holes,   the first nut holes and the third nut holes are arranged at the same positions in a circumferential direction and are respectively and evenly arranged at four positions in the circumferential direction, and   the second nut holes are evenly arranged at four positions in the circumferential direction and are arranged at positions which are deviated by 45° in the circumferential direction with respect to the first nut hole and the third nut hole.   
     
     
         8 . The pump device according to  claim 5 , wherein
 the waterproof plate is formed of a resin member that has a disk portion which is opposed to the nut plate, a first fitting portion which protrudes along the drive shaft from an inner peripheral edge portion of the disk portion and is fitted in an inner peripheral portion of the nut plate, a second fitting portion which protrudes from the first fitting portion along the drive shaft and is fitted in the central opening of the first wall, and a third fitting portion which is fitted in an inner peripheral wall of the housing space.   
     
     
         9 . The pump device according to  claim 8 , wherein
 the waterproof plate has a first sealing portion which is arranged in an outer peripheral portion of the second fitting portion and seals a portion between the waterproof plate and an inner peripheral portion of the central opening of the first wall and a second sealing portion which is arranged in an outer peripheral portion of the disk portion and seals a portion between the waterproof plate and the inner peripheral wall of the housing space.   
     
     
         10 . The pump device according to  claim 3 , wherein
 the drive source and the waterproof plate are fixed to an inside of the housing space of the pump body by fastening bolts to mounting nuts, which are provided on an outside of the housing space of the pump body, via a plurality of through holes provided in the fixing plate.   
     
     
         11 . The pump device according to  claim 10 , wherein
 the pump body is formed of a resin member, and   the mounting nuts are integrally embedded in the pump body.   
     
     
         12 . The pump device according to  claim 7 , wherein
 in a state where the housing space of the pump body is tightly closed, the bracket is attached to the first wall of the pump body to be exchangeable for each pitch of the plurality of through holes which corresponds to any one set of the nut holes among the first nut holes, the second nut holes and the third nut holes of the nut plate.   
     
     
         13 . The pump device according to  claim 1 , wherein
 the nut plate tightly contacts with the one side of the first wall of the pump body to be unrotatable when the pump head and the bracket are fixed to the other side of the first wall of the pump body.   
     
     
         14 . The pump device according to  claim 5 , wherein
 the plurality of sets of nut holes, which are provided in the nut plate, have first nut holes, second nut holes each of which is provided at a position at a longer distance from the center than the first nut holes, and third nut holes each of which is provided at a position at a longer distance from the center than the second nut holes,   the first nut holes and the third nut holes are arranged at the same positions in a circumferential direction and are respectively and evenly arranged at four positions in the circumferential direction, and   the second nut holes are evenly arranged at four positions in the circumferential direction and are arranged at positions which are deviated by 45° in the circumferential direction with respect to the first nut hole and the third nut hole.   
     
     
         15 . The pump device according to  claim 6 , wherein
 the plurality of sets of nut holes, which are provided in the nut plate, have first nut holes, second nut holes each of which is provided at a position at a longer distance from the center than the first nut holes, and third nut holes each of which is provided at a position at a longer distance from the center than the second nut holes,   the first nut holes and the third nut holes are arranged at the same positions in a circumferential direction and are respectively and evenly arranged at four positions in the circumferential direction, and   the second nut holes are evenly arranged at four positions in the circumferential direction and are arranged at positions which are deviated by 45° in the circumferential direction with respect to the first nut hole and the third nut hole.   
     
     
         16 . The pump device according to  claim 6 , wherein
 the waterproof plate is formed of a resin member that has a disk portion which is opposed to the nut plate, a first fitting portion which protrudes along the drive shaft from an inner peripheral edge portion of the disk portion and is fitted in an inner peripheral portion of the nut plate, a second fitting portion which protrudes from the first fitting portion along the drive shaft and is fitted in the central opening of the first wall, and a third fitting portion which is fitted in an inner peripheral wall of the housing space.